1980 Honda XL80s dirt bike doesn't want to rev?

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DeVoNXLZ

New member
hey i have a 1980 Honda XL80s dirt bike that doesn't want to rev up has limited power give it any more than half throttle it stutters at any rpm it likes mid revs only revs hi in first, the weird thing is it starts up perfectly and idles good first or second kick. doesn't run hot Carbs perfectly clean i have 2 main jets one that came with it is bigger the other is smaller it sputters less with the small one and but the other ones stock. iv rebuilt the engine lapped valves adjusted valve lash bought new gaskets points and condenser spark plug NGK R points are set correctly to corresponding f mark on the magneto flywheel engine timing marks are set correctly iv taken it apart 3 times now i need some good help for the next time thanks
 
i know this sounds weird..but i seen the magnets on the flywheel get week...at higher rpms they dont produce enough voltage to fire the plug under load..if you get an inline spark checker you can check this..neon testers work the best..watch the light as you rev the engine..if it starts to falter you will know its ignition.. if not then its fuel or valves..
 
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